Getting Previous ComboBox Value

Question

I want my application to capture a ComboBox value and then set the value selected by the user, or somehow get the previously selected value.

The fact is that in my form there are four lists and a ComboBox (which contains all the values ​​from the lists), and I want to return the ComboBox value back to the list from which it was taken, and then remove the newly selected item from another / the same list .

Answer 1

You want to handle the ComboBox.Enter event. Then save the SelectedItem or SelectedValue in a member variable. Whenever you want, you can reassign this value to the ComboBox.

Register an event. You can do this in one of two ways:

Do it through the designer. Select your combo box. In the Properties window, click the Lightning icon to display all of its events. Then find "Enter" and double-click in the box. It will automatically generate a callback function ("event handler") for you and hook it to the event.

You can do the same programmatically. In the constructor, attach the event handler to the correct signature:

 public partial class Form1 : Form { public Form1() { InitializeComponent(); comboBox1.Enter += comboBox1_Enter; } private void comboBox1_Enter(object sender, EventArgs e) { m_cb1PrevVal = comboBox1.SelectedValue; } private void RestoreOldValue() { comboBox1.SelectedValue = m_cb1PrevVal; } }